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Fig. 2. A typical twitch record, chosen as it has kinetics close to the mean values
obtained. Time to peak twitch tension Tpeak was measured
as the time from baseline force to peak force during activation. The time
taken for the muscle force to decline from its peak to 50% of its peak
(RT50%) and to 10% of its peak (i.e. a 90% decline in force;
RT90%) were used as indices for the rate of relaxation.